APA (7th ed.) Citation

Younghusband, F. E. (1941). Everest: The challenge. Thomas Nelson & Sons.

Chicago Style (17th ed.) Citation

Younghusband, Francis Edward. Everest: The Challenge. London ; New York: Thomas Nelson & Sons, 1941.

MLA (8th ed.) Citation

Younghusband, Francis Edward. Everest: The Challenge. Thomas Nelson & Sons, 1941.